So your proof of a conspiracy is to introduce another conspiracy. Interesting.

You do realize that every bar of gold sent from Germany had a serial number, a history of movement, and a description of its physical state, ie, scratches or other identifying marks. The same gold bars were returned without incident.

The fact that the Fed only allowed the auditors to only look at the gold before it was returned seems strange, but so what? The auditors did actually see their gold.